Fix celery

See merge request !11

# Conflicts:
#   ippisite/ippisite/decorator.py

the value for the field is:
- automatically deducted if there is only one ProteinDomainBoundComplex
  in the PPI
- NULL otherwise

WIP on #204

WIP on #204

WIP on #204

this complements work in a075f990
related to #204

as discussed with @osperand following up on #204

this is an additional fix for ligand issue raised in #204 and #208

FIX #11

as requested by @lchecaru in #208

- if test_type is "CELL", we DO need to keep the cell line name
- only create an entry in CellLine if name is not blank

FIX #200

new format is XXXXX,XXXXXXXXXX

problem raised in #204